{"id":396697,"date":"2024-12-08T16:35:00","date_gmt":"2024-12-08T16:35:00","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/pressure-dependency-mat_079\/"},"modified":"2024-12-23T01:47:41","modified_gmt":"2024-12-23T01:47:41","slug":"pressure-dependency-mat_079","status":"answered","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/pressure-dependency-mat_079\/","title":{"rendered":"Pressure dependency MAT_079"},"content":{"rendered":"<p>&lt;p&gt;Hello,&lt;\/p&gt;&lt;p&gt;I am using LS Dyna Workbench 2024R1. I have a 35m deep soil column, modelled with 35 x 1m solid elements, which I want to initialize for gravity load. The screenshot for the MAT_079 command snippet is below. I have calibrated the pressure dependency parameters b, a0, a1, a2 based on a target Vs profile and friction angle. I have run a gravity load analysis of the same column with a linear material model, and am using the stresses and strains from that as initial condition for the nonlinear gravity run. For some reason it appears that the program does not adjust the stiffness and strength properties with increasing pressure. The results I am getting are aligned with what I would expect based on the reference input shear stress vs shear strain curve (which is at 3.5m depth). When I assign a separate material to each element (35 separate parts) and give every material the stress strain curve as input that I calculate by hand based on my input parameters (b,a0,a1,a2), then the model works as I would expect. I also tried varying the PINIT parameter to vary between pressure and vertical stress (my model is restrained in both horizontal directions, only vertical strains), but it made no difference. I did consider this in my hand calculations.&lt;\/p&gt;&lt;p&gt;Hoping anybody can help me find out why the pressure dependency doesn&#8217;t seem to work. I thought the strains that I give with the *INITIAL STRAIN card should determine the pressure, based on which the shear stress &#8211; strain curve is adjusted automatically.&lt;\/p&gt;&lt;p&gt;Thanks.&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-396697","topic","type-topic","status-answered","hentry","topic-tag-soil-modeling"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello,I am using LS Dyna Workbench 2024R1. I have a 35m deep soil column, modelled with 35 x 1m solid elements, which I want to initialize for gravity load. The screenshot for the MAT_079 command snippet is below. I have calibrated the pressure dependency parameters b, a0, a1, a2 based on a target Vs profile\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/pressure-dependency-mat_079\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Pressure dependency MAT_079 | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hello,I am using LS Dyna Workbench 2024R1. I have a 35m deep soil column, modelled with 35 x 1m solid elements, which I want to initialize for gravity load. The screenshot for the MAT_079 command snippet is below. I have calibrated the pressure dependency parameters b, a0, a1, a2 based on a target Vs profile\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/pressure-dependency-mat_079\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-12-08T16:35:00+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-12-23T01:47:41+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Pressure dependency MAT_079 | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hello,I am using LS Dyna Workbench 2024R1. I have a 35m deep soil column, modelled with 35 x 1m solid elements, which I want to initialize for gravity load. The screenshot for the MAT_079 command snippet is below. I have calibrated the pressure dependency parameters b, a0, a1, a2 based on a target Vs profile\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/pressure-dependency-mat_079\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/soil-modeling\\\/#listItem\",\"name\":\"soil-modeling\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/soil-modeling\\\/#listItem\",\"position\":3,\"name\":\"soil-modeling\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/soil-modeling\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/pressure-dependency-mat_079\\\/#listItem\",\"name\":\"Pressure dependency MAT_079\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/pressure-dependency-mat_079\\\/#listItem\",\"position\":4,\"name\":\"Pressure dependency MAT_079\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/soil-modeling\\\/#listItem\",\"name\":\"soil-modeling\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/pressure-dependency-mat_079\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/pressure-dependency-mat_079\\\/\",\"name\":\"Pressure dependency MAT_079 | Ansys Learning Forum\",\"description\":\"Hello,I am using LS Dyna Workbench 2024R1. I have a 35m deep soil column, modelled with 35 x 1m solid elements, which I want to initialize for gravity load. The screenshot for the MAT_079 command snippet is below. I have calibrated the pressure dependency parameters b, a0, a1, a2 based on a target Vs profile\",\"inLanguage\":\"en-US\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/pressure-dependency-mat_079\\\/#breadcrumblist\"},\"datePublished\":\"2024-12-08T16:35:00+00:00\",\"dateModified\":\"2024-12-23T01:47:41+00:00\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"inLanguage\":\"en-US\",\"publisher\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\"}}]}\n\t\t<\/script>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"Pressure dependency MAT_079 | Ansys Learning Forum","description":"Hello,I am using LS Dyna Workbench 2024R1. I have a 35m deep soil column, modelled with 35 x 1m solid elements, which I want to initialize for gravity load. The screenshot for the MAT_079 command snippet is below. I have calibrated the pressure dependency parameters b, a0, a1, a2 based on a target Vs profile","canonical_url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/pressure-dependency-mat_079\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/pressure-dependency-mat_079\/#breadcrumblist","itemListElement":[{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum#listItem","position":1,"name":"Home","item":"https:\/\/innovationspace.ansys.com\/forum","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/topics\/#listItem","name":"Topics"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/topics\/#listItem","position":2,"name":"Topics","item":"https:\/\/innovationspace.ansys.com\/forum\/topics\/","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/soil-modeling\/#listItem","name":"soil-modeling"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum#listItem","name":"Home"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/soil-modeling\/#listItem","position":3,"name":"soil-modeling","item":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/soil-modeling\/","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/pressure-dependency-mat_079\/#listItem","name":"Pressure dependency MAT_079"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/topics\/#listItem","name":"Topics"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/pressure-dependency-mat_079\/#listItem","position":4,"name":"Pressure dependency MAT_079","previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/soil-modeling\/#listItem","name":"soil-modeling"}}]},{"@type":"Organization","@id":"https:\/\/innovationspace.ansys.com\/forum\/#organization","name":"Ansys Learning Forum","description":"Ansys Innovation Space","url":"https:\/\/innovationspace.ansys.com\/forum\/"},{"@type":"WebPage","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/pressure-dependency-mat_079\/#webpage","url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/pressure-dependency-mat_079\/","name":"Pressure dependency MAT_079 | Ansys Learning Forum","description":"Hello,I am using LS Dyna Workbench 2024R1. I have a 35m deep soil column, modelled with 35 x 1m solid elements, which I want to initialize for gravity load. The screenshot for the MAT_079 command snippet is below. I have calibrated the pressure dependency parameters b, a0, a1, a2 based on a target Vs profile","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/pressure-dependency-mat_079\/#breadcrumblist"},"datePublished":"2024-12-08T16:35:00+00:00","dateModified":"2024-12-23T01:47:41+00:00"},{"@type":"WebSite","@id":"https:\/\/innovationspace.ansys.com\/forum\/#website","url":"https:\/\/innovationspace.ansys.com\/forum\/","name":"Ansys Learning Forum","description":"Ansys Innovation Space","inLanguage":"en-US","publisher":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#organization"}}]},"og:locale":"en_US","og:site_name":"Ansys Learning Forum | Ansys Innovation Space","og:type":"article","og:title":"Pressure dependency MAT_079 | Ansys Learning Forum","og:description":"Hello,I am using LS Dyna Workbench 2024R1. I have a 35m deep soil column, modelled with 35 x 1m solid elements, which I want to initialize for gravity load. The screenshot for the MAT_079 command snippet is below. I have calibrated the pressure dependency parameters b, a0, a1, a2 based on a target Vs profile","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/pressure-dependency-mat_079\/","article:published_time":"2024-12-08T16:35:00+00:00","article:modified_time":"2024-12-23T01:47:41+00:00","twitter:card":"summary_large_image","twitter:title":"Pressure dependency MAT_079 | Ansys Learning Forum","twitter:description":"Hello,I am using LS Dyna Workbench 2024R1. I have a 35m deep soil column, modelled with 35 x 1m solid elements, which I want to initialize for gravity load. The screenshot for the MAT_079 command snippet is below. I have calibrated the pressure dependency parameters b, a0, a1, a2 based on a target Vs profile"},"aioseo_meta_data":[],"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\" title=\"Home\">Home<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\/topics\/\" title=\"Topics\">Topics<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/soil-modeling\/\" title=\"soil-modeling\">soil-modeling<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tPressure dependency MAT_079\n\t\t<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/innovationspace.ansys.com\/forum"},{"label":"Topics","link":"https:\/\/innovationspace.ansys.com\/forum\/topics\/"},{"label":"soil-modeling","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/soil-modeling\/"},{"label":"Pressure dependency MAT_079","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/pressure-dependency-mat_079\/"}],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27814"],"_bbp_topic_id":["396697"],"_bbp_subscription":["76136","471944"],"_bbp_author_ip":["198.52.144.45"],"_bbp_last_reply_id":["398318"],"_bbp_last_active_id":["398318"],"_bbp_last_active_time":["2024-12-23 14:10:57"],"_bbp_reply_count":["6"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["76136","471944"],"_btv_view_count":["564"],"_bbp_topic_status":["answered"]},"test":"b915f170bcd94e14eaf35f6812a2eb7400e8cd4e"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/396697","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/396697\/revisions"}],"predecessor-version":[{"id":398226,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/396697\/revisions\/398226"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=396697"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}